J Integr Plant Biol. ›› 2023, Vol. 65 ›› Issue (4): 888-894.DOI: 10.1111/jipb.13412

• Breakthrough Reports • Previous Articles     Next Articles

Arabidopsis phytochromes A and B synergistically repress SPA1 under blue light

Xiaolin Jia1†, Meifang Song2,3†, Shaoci Wang1, Tong Liu1, Lijian Wang1,4, Lin Guo3, Liang Su3,5, Yong Shi1, Xu Zheng1* and Jianping Yang1,3*   

  1. 1. State Key Laboratory of Wheat and Maize Crop Science, and Center for Crop Genome Engineering, Longzi Lake Campus, College of Agronomy, Henan Agricultural University, Zhengzhou 450046, China;
    2. Institute of Radiation Technology, Beijing Academy of Science and Technology, Beijing 100875, China;
    3. Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China;
    4. Henan Police College, Zhengzhou 450046, China;
    5. Beijing Genseed Technology Co., Ltd., Beijing 100080, China
    Xiaolin Jia and Meifang Song contributed equally to this work.
    *Correspondences: Xu Zheng (zhengxu@henau.edu.cn); Jianping Yang (jpyang@henau.edu.cn, Dr. Yang is fully responsible for the distribution of the materials associated with this article)
  • Received:2022-08-08 Accepted:2022-11-16 Online:2022-11-17 Published:2023-04-01

Abstract: In Arabidopsis, although studies have demonstrated that phytochrome A (phyA) and phyB are involved in blue light signaling, how blue light‐ activated phytochromes modulate the activity of the CONSTITUTIVELY PHOTOMORPHOGENIC1 (COP1)‐SUPPRESSOR OF PHYA‐105 (SPA1) E3 complex remains largely unknown. Here, we show that phyA responds to early and weak blue light, whereas phyB responds to sustainable and strong blue light. Activation of both phyA and phyB by blue light inhibits SPA1 activity. Specifically, blue light irradiation promoted the nuclear import of both phytochromes to stimulate their binding to SPA1, abolishing SPA1's interaction with LONG HYPOCOTYL 5 (HY5) to release HY5, which promoted seedling photomorphogenesis.

Key words: Arabidopsis, blue light, phytochrome, SPA1

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